Stripping device



P 1927' M. A. MARQ STRIPPING DEVICE Filed Sept. 29. 1925 I. III! IINVENTOR mnnvon-A. meaeun'rrn, -or cnrcornn FALLS,unssecnnsnmsignssienonmorm:

' msx nunnnnoommnr, or cmeornn runs, mssscnusar s, 1'' 1003mm pormessecnusn'rrs. a f s 5 STRIPPING DEVICE.

Application m ss s 29,,ie25. sens-increase My present invention relatesto the stripntowardsthejend of thanrmsotothe ping from theirLvuleanizihg"mandrels of; mandreleenthe twopi'f o" rubber tubes such as are used forinner tubes The hit f; the casing 121 i Ebnfiected for automobile tirecasings. Since the 'adto pipes 2 liich, throughgi flv 22 6 1;

6 vent of the so-called balloon tire it-is becomnectfw-ithfavacuumproducing device. The ing more and more customary to vulcanize valve isof the. usual three-way type, by the larger'tubes'which these tiresrequire on means of which. the inside of the casing can 60 a circularmandrels. The operation .of-stri'pbe ccnnectedeither to the vacuum or tothe ping the tubes from these circular mandrels air. 1 l j 10 moredifiicult p p- The shaft is formed witha screw thread pmg tubes fromstralght mandre s S as '23 meshing. with a correspondingthreadin wereused before, and renders even more deth i id f th jd l b '1 B thisirablethe use of-some'mecha uca d construction rotation of theshaftwill both According to my present invention the tubes turnth arm 7 andcause h to take 15 are first separated from their mandrelsby acork-screw path. This motion of the arm exerting a suction upon them,and th y ar corresponds with the pitch offthe spiral on l expanded, ayf1"0m the? m which the mandrel is formed. Any suitable whlle he an l 1Swl h r w 'means can be provided forrotating the shaft Referrlng to thedrawlngs, in ei'therdirection desired; 1

20 Fig. 1 is a side elevation, partly broken The operation of thedevicemay now be away, showing in full lines the start of the considered. Amandrelc with a tube 7) stripping operation, and in dottedlines timeupon it is mounted in the clamp formed bv position of the parts afterthe stripping is the arm 17.;and the member 19, and the completed. v"liandscrew QO-tightened, while the shaft Fig. 2 isa front elevation ofthe same; 15 and the arm 17 are in the osjtiohs Fig. 3 is a frontelevation, with. certain show'nin dotted lines in Fig. 1. y rotatpartsomitted, showing an intermediate stage ing the shaft the mandrel maynow; be

' in the stripping operation; causedto. thread itself into the casing,as-

Fig. 4:. is a sectionon line 4--4. of Fig. 2; suming the posit-ionshown-in full lines in 30 d p v e that figure.- This corresponds totheshow gig. 5 is a section on line 5+5 of Fig.3. ing in Fig. '2, The endsof the rubber tube he mandrels which have been shown in are nowfoldedback'over the ends. of the the drawings are of helical form and ofgencasing, as shown in'Fig. 3, and the vacuum c 5 erally oval crosssection, although the shape turned on. This causes the tube to leave;

may be varied Uponthe frame lOof a base the mandrel and stretch itselfto'the inside 11 is mounted a hollow casing 12 of substansurface of thecasing, as is shown by the t A tially the shape of the mandrel to beused contrast between the positions of the tube 9 and formed in ahelixin the same manner shown in Figs. 4 and 5. The mandrel-is} as themandrel. This casing is supported thus freed from all frictional,restraint, for convenience on a bracket 13 and't e top after the tubehasbeen removed from 0011-. end isheld by brackets 14: at its sides. .Thetact with it, and by a simple rotationofthe' a casing is" arrangedconcentrically .wlth a shaft can be threaded out of the"casing-and swift15 which passes through a 'ournalbox tube. .An intermediate stage inthis opera 1 mounted on the frame 10.? n the end tion is shown inFig-:3; When the mandrel of the shaft is figzed an. arin 17.,hav1n'g itshas beenentirelyremoved from thecasigfii "I outer end formed toextendlfabolit half way it may be released from theflcl'amp 'fomi Iaroundthe endof the mandrel. 'Pivotedto by arm-17 andmember 19and taken0d the v .the arm 211118 is .a swinging member 19 hav machine. yacuummaynow'bebroken ing its end formed similarly to theend ofby,turmngthefivalve22 soas to adm t air f arm 17., .A hand 's'erew'h20asses-ma -betwee urs-c sisg-sna the tube Thelat through the member 19and is-screwed into Iter' wr teup-same to the size which ,3 I the arm17. By tightening: the screw the it readily ends oi.the-'swingingmembercan 'bed'l'm v'lr 'as1ng apparatus 13 i no; ready forthe stripping of another tu e.

It Will be understood that changes may bemade in the details of themechanism and that the proportion and arrangement of parts may be variedwithin wide limits while keeping Within the scope of the invention aspointedout in the appended claims. Furthermore, by a simple mversion ofoperations the apparatus described may be used to place tubes onmandrels instead of removing them therefrom. The tube is inserted in thecasing 12. its ends folded back, and the vacuum applied. The mandrel maynow be inserted and the vacuum released, whereupon the tube willcontract upon the mandrel.

Having thus described my invention claim:

1. A device for stripping tubes from spiral mandrels which comprises acasing having a curvature similar to and a crosssection larger than thatof the tube when mounted on the mandrel, means for exhausting air frombetween the tube and the casing to free the tube from the mandrel, andmeans for moving the mandrel within the casing in the spiral path.

2. A device for stripping rubber tubes from spiral mandrels comprising acasing having a curvature similar to that of the mandrel andcross-sectional size larger than the tube, means for holding a mandreldetachably inside the casing and for moving the mandrel within thecasing in a spiral path, and means for exhausting air from between thetube and the casing.

3. A device for strippingrubber tubes from spiral mandrels whichcomprises a support, a spiral casing fixed to said support, a shaftjournaled in said support, an arm fixed on said support, mandrelclamping means carried by the arm, means for controlling the rotation ofthe shaft so that said clamping means Will travel in a curvecorresponding to the axis of the casing, and means for exhausting theair from the inside of said casing.

vMELVON A. MARQUETTE.

